The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 1991
Filed:
Jul. 20, 1989
Willis P Nichols, Cleveland, OH (US);
Jack L Karn, Richmond Heights, OH (US);
The Lubrizol Corporation, Wickliffe, OH (US);
Abstract
A process is disclosed for overbasing a substrate comprising mixing a composition comprising said substrate, water, a phenol containing up to three aliphatic carbon atoms, a source of magnesium and a carbonating agent, under reaction conditions to form a magnesium overbased substrate, said water being retained in said composition throughout the overbasing reaction, the weight ratio of the water to magnesium being about 10:1 to about 1:5. A magnesium overbased substrate made by the foregoing process is disclosed. Concentrates and lubricating compositions containing the foregoing magnesium overbased substrate are also disclosed.